A method and system for configuring at least one communication interface module in a control or automation system includes a communication interface module for coupling at least two field bus systems. At least one first functional unit integrated in the communication interface module implements a connection to a configured superordinate controller via a first communication link on the basis of a first field bus protocol. At least one second functional unit integrated in the communication interface module implements a connection for field devices via a second communication link on the basis of a second field bus protocol. At least one further, third functional unit integrated in the communication interface module is configured to connect further field devices via input and/or output functionalities integrated in the communication interface module, and at least one serial interface integrated in the communication interface module can be used to configure the communication interface module.